545917891 has 2 divisors, whose sum is σ = 545917892. Its totient is φ = 545917890.

The previous prime is 545917877. The next prime is 545917921. The reversal of 545917891 is 198719545.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 545917891 - 2⁷ = 545917763 is a prime.

It is not a weakly prime, because it can be changed into another prime (545914891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272958945 + 272958946.

It is an arithmetic number, because the mean of its divisors is an integer number (272958946).

Almost surely, 2^545917891 is an apocalyptic number.

545917891 is a deficient number, since it is larger than the sum of its proper divisors (1).

545917891 is an equidigital number, since it uses as much as digits as its factorization.

545917891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 49.

The square root of 545917891 is about 23364.8858546324. The cubic root of 545917891 is about 817.2892297053.

The spelling of 545917891 in words is "five hundred forty-five million, nine hundred seventeen thousand, eight hundred ninety-one".